Let \( C \) be the curve \( y=x^{3} \) (where \( \mathrm{x} \) takes all real values). The tange...

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Let \( C \) be the curve \( y=x^{3} \) (where \( \mathrm{x} \) takes all real values). The tangent at \( A \) meets the curve again at \( B \). If the gradient at \( B \) is \( K \) times the gradient at \( A \) the \( K \) is equal to
(a) 4
(b) 2
(c) -2
(d) \( 1 / 4 \)
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